Pension and Other Benefit Plans (Narrative) (Details) (USD $)	12 Months Ended
Mar. 31, 2015	Mar. 31, 2014	Mar. 31, 2013
Defined Benefit Plan Disclosure [Line Items]
Total liabilities	$ 297,605,000us-gaap_Liabilities	$ 307,388,000us-gaap_Liabilities
Accrued liabilities	50,263,000us-gaap_AccruedLiabilitiesCurrent	52,348,000us-gaap_AccruedLiabilitiesCurrent
Other non-current liabilities	87,224,000us-gaap_OtherLiabilitiesNoncurrent	67,388,000us-gaap_OtherLiabilitiesNoncurrent
Charge recorded for contributions to defined contribution plans	2,998,000	2,658,000	2,484,000
Fair value of plan assets at beginning of year	188,228,000
Fair value of plan assets at end of year	204,201,000	188,228,000
(Level 3)
Defined Benefit Plan Disclosure [Line Items]
Fair value of plan assets at end of year	17,471,000	17,106,000
Pension Plans
Defined Benefit Plan Disclosure [Line Items]
Estimated net loss for defined benefit pension plans that will be amortized from accumulated other comprehensive loss	3,928,000
Prior service cost that will be amortized from accumulated other comprehensive loss	9,000
Expected contribution to pension plans in 2015	5,908,000
Employer contribution	11,013,000	11,041,000
Assumed percentage increase for healthcare costs	7.00%
Ultimate healthcare trend rate in five years	5.00%
Discount rate	3.83%	4.60%	4.35%
Net periodic pension cost	1,361,000	5,838,000	7,464,000
Fair value of plan assets at beginning of year	188,228,000	167,017,000
Fair value of plan assets at end of year	204,201,000	188,228,000	167,017,000
Pension Plans \| (Level 3)
Defined Benefit Plan Disclosure [Line Items]
Fixed income securities investment return	751,000
Disbursements	386,000
Postretirement Benefit Plans
Defined Benefit Plan Disclosure [Line Items]
Expected contribution to pension plans in 2015	675,000
Retirement age	65 years
Percentage of premium contributed	100.00%
Estimated net loss for defined benefit postretirement health care plans that will be amortized from accumulated other comprehensive loss	130,000
Discount rate	3.45%	3.90%
Net periodic pension cost	269,000	355,000	366,000
Postretirement Benefit Plans \| American Association of Retired Persons
Defined Benefit Plan Disclosure [Line Items]
Employer contribution	35
Defined Benefit Postretirement Life Insurance
Defined Benefit Plan Disclosure [Line Items]
Net periodic pension cost	237,000
Total liabilities	4,320,000
Accrued liabilities	4,180,000
Other non-current liabilities	140,000
Cash Surrender Value of Life Insurance	$ 2,528,000	$ 2,388,000

Defined Benefit Plan, Contribution by Employer Percentage of Premium

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Defined Benefit Plan, Retirement Age

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Carrying value as of the balance sheet date of obligations incurred and payable, pertaining to costs that are statutory in nature, are incurred on contractual obligations, or accumulate over time and for which invoices have not yet been received or will not be rendered. Examples include taxes, interest, rent and utilities. Used to reflect the current portion of the liabilities (due within one year or within the normal operating cycle if longer).

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Carrying amount as of the balance sheet date of amounts which could be received based on the terms of the insurance contract upon surrendering life policies owned by the entity.

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The amount of the prior service cost or credit recognized in net periodic benefit cost relating to benefit changes attributable to plan participants' prior service pursuant to a plan amendment or a plan initiation.

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Amount included in accumulated other comprehensive income (AOCI) expected to be recognized as components of net periodic benefit cost for the fiscal year that follows the most recent annual statement of financial position, including gain (loss), prior service cost (credit), and transition asset (obligation).

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The interest rate used to adjust for the time value of money for the plan.

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The increase in the fair value of plan assets from contributions made by the employer.

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Amount of benefits from a defined benefit plan expected to be paid in the next fiscal year following the latest fiscal year. Excludes interim and annual periods when interim periods are reported on a rolling approach, from latest balance sheet date.

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Assets, usually stocks, bonds, and other investments, that have been segregated and restricted (usually in a trust) to provide benefits, at their fair value as of the measurement date. Plan assets include amounts contributed by the employer (and by employees for a contributory plan) and amounts earned from investing the contributions, less benefits paid. If a plan has liabilities other than for benefits, those non-benefit obligations may be considered as reductions of plan assets.

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Amount included in accumulated other comprehensive income (AOCI) related to gain (loss) expected to be recognized as components of net periodic benefit cost for the fiscal year that follows the most recent annual statement of financial position.

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The assumed health care cost trend rate for the next year used to measure the expected cost of benefits covered by the plan (gross eligible charges). This is based upon the annual rate of change in the cost of health care benefits currently provided by the postretirement benefit plan, due to factors other than changes in the composition of the plan population by age and dependency status.

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The total amount of net periodic benefit cost for defined benefit plans for the period. Periodic benefit costs include the following components: service cost, interest cost, expected return on plan assets, gain (loss), prior service cost or credit, transition asset or obligation, and gain (loss) due to settlements or curtailments.

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The amount of the cost recognized during the period for defined contribution plans.

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Amount of transfers of financial instrument classified as an asset out of level 3 of the fair value hierarchy.

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Sum of the carrying amounts as of the balance sheet date of all liabilities that are recognized. Liabilities are probable future sacrifices of economic benefits arising from present obligations of an entity to transfer assets or provide services to other entities in the future.

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Amount, after investment expense, of income earned from investments in securities and real estate. Includes, but is not limited to, real estate investment, policy loans, dividends, and interest. Excludes realized gain (loss) on investments.

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